
<h1><span class="yiyi-st" id="yiyi-12">numpy.tril</span></h1>
        <blockquote>
        <p>原文：<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.tril.html">https://docs.scipy.org/doc/numpy/reference/generated/numpy.tril.html</a></p>
        <p>译者：<a href="https://github.com/wizardforcel">飞龙</a> <a href="http://usyiyi.cn/">UsyiyiCN</a></p>
        <p>校对：（虚位以待）</p>
        </blockquote>
    
<dl class="function">
<dt id="numpy.tril"><span class="yiyi-st" id="yiyi-13"> <code class="descclassname">numpy.</code><code class="descname">tril</code><span class="sig-paren">(</span><em>m</em>, <em>k=0</em><span class="sig-paren">)</span><a class="reference external" href="http://github.com/numpy/numpy/blob/v1.11.3/numpy/lib/twodim_base.py#L423-L458"><span class="viewcode-link">[source]</span></a></span></dt>
<dd><p><span class="yiyi-st" id="yiyi-14">数组的下三角形。</span></p>
<p><span class="yiyi-st" id="yiyi-15">返回数组的副本，其元素高于<em class="xref py py-obj">k</em>对角线零。</span></p>
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<tr class="field-odd field"><th class="field-name"><span class="yiyi-st" id="yiyi-16">参数：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-17"><strong>m</strong>：array_like，shape（M，N）</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-18">输入数组。</span></p>
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<p><span class="yiyi-st" id="yiyi-19"><strong>k</strong>：int，可选</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-20">对角线以上的零元素。</span><span class="yiyi-st" id="yiyi-21"><em class="xref py py-obj">k = 0</em>（默认）是主对角线，<em class="xref py py-obj">k 低于它并且<em class="xref py py-obj">k&gt; 0</em>以上。</em></span></p>
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<tr class="field-even field"><th class="field-name"><span class="yiyi-st" id="yiyi-22">返回：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-23"><strong>tril</strong>：ndarray，shape（M，N）</span></p>
<blockquote class="last">
<div><p><span class="yiyi-st" id="yiyi-24"><em class="xref py py-obj">m</em>的下三角形，具有与<em class="xref py py-obj">m</em>相同的形状和数据类型。</span></p>
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<div class="admonition seealso">
<p class="first admonition-title"><span class="yiyi-st" id="yiyi-25">也可以看看</span></p>
<dl class="last docutils">
<dt><span class="yiyi-st" id="yiyi-26"><a class="reference internal" href="numpy.triu.html#numpy.triu" title="numpy.triu"><code class="xref py py-obj docutils literal"><span class="pre">triu</span></code></a></span></dt>
<dd><span class="yiyi-st" id="yiyi-27">同样的东西，只为上三角形</span></dd>
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<p class="rubric"><span class="yiyi-st" id="yiyi-28">例子</span></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">tril</span><span class="p">([[</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">],[</span><span class="mi">4</span><span class="p">,</span><span class="mi">5</span><span class="p">,</span><span class="mi">6</span><span class="p">],[</span><span class="mi">7</span><span class="p">,</span><span class="mi">8</span><span class="p">,</span><span class="mi">9</span><span class="p">],[</span><span class="mi">10</span><span class="p">,</span><span class="mi">11</span><span class="p">,</span><span class="mi">12</span><span class="p">]],</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span>
<span class="go">array([[ 0,  0,  0],</span>
<span class="go">       [ 4,  0,  0],</span>
<span class="go">       [ 7,  8,  0],</span>
<span class="go">       [10, 11, 12]])</span>
</pre></div>
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